http://www.biodiversitylibrary.org/
Bulletins de l'Académie royale des sciences, des lettres et
des beaux-arts de Belgique.
Bruxelles.
http://www.biodiversitylibrary.org/bibliography/5550
ser.3:t.1 (1891):
http://www.biodiversitylibrary.org/item/111255 Page(s): Page 633, Page 634Contributed by: Missouri Botanical Garden, Peter H. Raven Library Sponsored by: Missouri Botanical Garden
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